2.0 GENERAL INFORMATION
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is warrant-
ed for One Year parts and labor. If any questions or problems arise
during installation or use of this product, please do not hesitate to con-
tact Patton Electronics Technical Support at (301)-975-1007.
2.1 FEATURES
• Bi-directionally converts synchronous RS-232 to V.35
• Data rates to 384 Kbps, full or half duplex
• Transparent to protocol
• No AC power or batteries required
• DCE/DTE strap selectable
• DB-25 and M/34 connectors with integral 6 ft cable (Model 2020)
• Dual DB-25 connectors with integral 6ft cable (Model 2020-25)
• DB-25 and M/34 connectors in one plastic enclosure (Model
2020N)
• Circuitry housed in ultra-miniature case
• Made in the USA.
2.2 DESCRIPTION
The Model 2020 and 2020N RS-232 to V.35 converters let a
synchronous RS-232 device communicate bi-directionally with a syn-
chronous V.35 device. The Model 2020/2020N require no external AC
power or batteries to operate and supports data rates to 384 Kbps.
Operating full or half duplex, the Model 2020 passes all necessary
clocking and control signals, and is transparent to protocol.
The Model 2020 connects directly to the synchronous RS-232
interface using a male or female DB-25 connector. A male or female
M/34 connector at the end of an integral 6 ft cable plugs into the V.35
device. The Model 2020-25 substitutes a male or female DB-25 on the
V.35 interface. The Model 2020N house both DB-25 and M/34 connec-
tors within the same enclosure.
An internal DCE/DTE strap allows the user to configure the Model
2020/2020N as "DCE to DTE" or "DTE to DCE". In most cases, this
eliminates the need for special crossover cables. Housed in an ultra-
miniature case measuring only 2.66" x 2.10" x 0.73", the Model 2020
fits easily into tight locations. The Model 2020N measures a tiny
3.20”L x 2.10”H x 0.90”W.
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3.0 CONFIGURATION
The Model 2020/2020N is designed to be easy to use. In most
cases you will not need to configure the Model 2020/2020N in
any
way: just plug it in and go! The Model 2020 is transparent to protocol,
including data rate and clocking method. the only configuration you
may need to do is for DTE/DCE orientation. This procedure is
described below.
3.1 SETTING DCE/DTE ORIENTATION
The Model 2020/2020N installs between DTE devices such as
terminals and host computers, and DCE devices such as modems,
multiplexers and CSU/DSUs. Most often the DTE device will be RS-
232, and the DCE device will be V.35. Therefore, the default
DCE/DTE setting for the Model 2020 is RS-232 DCE to V.35 DTE,
based on how the Model 2020 "sees" its
own orientation. For exam-
ple, if the Model 2020 sees its own RS-232 port as DCE, it will want to
plug into an RS-232 DTE device such as a terminal.
If you need to reverse the DCE/DTE orientation of the Model 2020
so that the RS-232 port is DTE and the V.35 port is DCE, follow the
step-by-step instructions below (note: it is not possible to configure the
Model 2020/2020N so that both ports are DTE or DCE).
3.1.1 OPENING THE CASE
The DCE/DTE strap on the Model 2020/2020N is located on the
PC board. To access the PC board you will need to open the plastic
case.
1. Simply insert a small flathead screwdriver or similar tool
between the DB-25 connector and the lip of the case as
shown in Figure 1, below.
Figure 1. Inserting the screwdriver
RS-232
Interface
